Dear wtg4baby -
The fibroid question is the easier of the two to answer. Generally we recommend operating on fibroids if they are affecting the cavity, or if they are in the wall of the uterus and > 4 cm in diameter (i.e. on the big side), and the choice to operate on the bigger fibroids that are not affecting the cavity is a subject of debate in our specialty - no clearcut answer.
Similarly giving heparin is not a clear cut decision.
There are not always clear answers, and your new REI seems to have given some serious thought to your history. You should discuss the final treatment choice with your new REI after the results of the genetic testing are available, and decide what choices you feel most comfortable with.